Parallel arm lamp



FIG. 1 is an elevation view of a parallel arm lamp showing my new design, with the broken lines showing for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a rear view of a parallel arm lamp showing my new design;

FIG. 3 is a first side view of a parallel arm lamp showing my new design;

FIG. 4 is a front view of a parallel arm lamp showing my new design;

FIG. 5 is a second side view of a parallel arm lamp showing my new design;

FIG. 6 is a top view of a parallel arm lamp showing my new design; and,

FIG. 7 is a bottom view of a parallel arm lamp showing my new design. 

The ornamental design for a parallel arm lamp, as shown and described. 